超音波ポスト除去時のポストおよび根元表面の温度上昇

Temperature rise of the post and on the root surface during ultrasonic post removal.

抄録

目的:

実験室において、様々な装置や技術を用いた超音波ポスト除去による根面温度の上昇を測定すること。

AIM: To determine the temperature rise on the root surface caused by ultrasonic post removal using different devices and techniques in a laboratory setting.

研究方法:

圧電式（Pi）と磁歪式（Ma）の2つの超音波デバイスを調査した。ヒト下顎第一大臼歯の遠位根管に鋸歯状チタンポストを埋入した．冷却水には，空気，水，排気なし（NN），空気のみ高速排気（A），15 mL min(-1) 水冷却水高速排気（W15），30 mL min(-1) 水冷却水高速排気（W30）の4種類のパラメータを使用した．各冷媒パラメータについて，ポスト(P)とルート(R)の2箇所で5回の模擬ポスト除去を測定した．温度上昇は較正済み赤外線サーモグラフィーを用いて30, 60, 90, 120秒間隔で測定した(n = 80)。温度は 45ms 間隔で記録した。データは、Scheffeポストホックテストを用いた反復測定アノバで分析された（P <または= 0.05）。

METHODOLOGY: Two ultrasonic devices, one piezoelectrical (Pi) and one magnetostrictive (Ma), were investigated. A serrated titanium post was placed into the distal root canal of a human mandibular first molar. Four coolant parameters were utilized: no air, no water, no evacuation (NN), air only with high-speed evacuation (A), 15 mL min(-1) water coolant with high-speed evacuation (W15) and 30 mL min(-1) water coolant with high-speed evacuation (W30). Five simulated post removals were measured at two locations, the post (P) and the root (R), for each coolant parameter. Temperature rise was measured at 30, 60, 90 and 120 s intervals using calibrated infrared thermography (n = 80). Temperatures were recorded at 45 ms intervals. Data were analysed using repeated measures anova with the Scheffe post hoc test (P < or = 0.05).

結果:

全体の平均的なプール効果は、P = 20.1 +/- 27.9 度 C と R = 10.9 +/- 7.9 度 C の温度上昇に有意差があることを示した。温度上昇の有意差はPi > Ma, P > R, NN > A = W15 = W30 ただし、A > W30であった。

RESULTS: The overall mean pooled effect showed that temperature rise for P = 20.1 +/- 27.9 degrees C and R = 10.9 +/- 7.9 degrees C were significantly different. Significant differences in temperature rise were: Pi > Ma, P > R, NN > A = W15 = W30 however, A > W30.

結論:

超音波装置，歯牙上の位置，除去後の冷却方法によって，温度上昇に有意差が認められた．

CONCLUSIONS: There were significant differences in temperature rise as a function of ultrasonic device, location on the tooth and cooling method utilized for post removal.